package com.hmdp.utils;


import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    //利用Redis的increment自增长实现序列号增长
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    private static final long BEGIN_TIMESTAMP=1735689600;

    //全局id生成器
    public long nextId(String keyPrefix)
    {
        //生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond= now.toEpochSecond(ZoneOffset.UTC);
        long timestamp=nowSecond-BEGIN_TIMESTAMP;

        //生成序列号
        //获取当前日期，精到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));

        //自增长
        Long count = stringRedisTemplate.opsForValue().increment("icr" + keyPrefix + ":" + date);

        //拼接并返回
        return  timestamp<<32|count;


    }




}
